which has been the primary source of energy in the most recent century

Answer 1

In the most recent century, the primary source of energy has been fossil fuels, such as coal, oil, and natural gas. These sources of energy have been widely used for electricity generation, transportation, heating, and industrial processes. However, there has been a growing shift towards renewable energy sources, such as solar, wind, and hydropower, in recent years due to concerns about climate change and environmental sustainability.